In 2014, commodity prices began to fall, and mine capital expenditures also declined. However, due to the drop in capital expenditure to the decline in mine production, there is actually a two-to-three-year lag, so the mining terminal began to increase its capital expenditures in 2013, but the actual volume needs to start from 2018 and 2019. Zhu Xi also used the PPT below to build a model for copper. From 2019, there will be a shortage of copper. If several large copper mines do not have a key production input, they will have a great impact on the supply of the industry.